Dragons are a grand classic of fantasy. For this question, let's assume we're talking about the following stereotype:
hatches from an ostrich-sized egg and can grow to mountain size if nothing limits ...

A livescience.com article claims that trees can reach a theoretical height of 400 to 426 feet (122 to 130m). This is due to the tree being unable to carry water up to the top at that certain point due ...

So I had a funny idea, somewhat based off the cow in the Restaurant at the End of the Universe in the Hitchhikers Guide. You know the one—that wants to be eaten and whose only purpose in life is to be ...

Don't go into the bonegrass. Seriously, unless you want to be dead. You go in there, brush the grass with your clothes, start to feel sleepy...
Before too long your limbs will go numb, then you're on ...

If we accept that dragons are big and they hoard gold and gems (and don't make or mine these baubles, themselves), how do dragons physically manipulate and transport human/elf/dwarf-sized coins and ...

Of all the creatures in Hatjörn's dominion, there is none as peculiar as the Murinae Spirita, the mean booze-rat. A vermin so resilient that has developed the most wondrous means of defence and thus ...

In the Land of Metal, there exists a tribe that has upheld the gospel of Manowar with such zeal that it modified their bodies.
Metalheads descend from humans, and may look human at a glance. A more ...

I have a creature or more accurately creatures that I have a problem with. I can't figure out why it is afraid of water.
They are landbased tiny tiny little piranha like organisms that work in unison....

Is there a plausible makeup for a lifeform which is highly resistant to even very advanced firearms (or any ranged weaponry for that matter), but can be injured more readily (albeit still a major feat)...

This creature exists in an infinite world, a flat landscape that extends ad infinitum, where light rains from the sky from infinity during recurrent day-night cycles, and, similarly, the ground goes ...

I'm making this whole other alien world and I made it an ammonia world, so there is a lot of nitrogen in the atmosphere. Would nitrogen be a good gas to breathe in an ammonia world and would Cobalt be ...

Enter the [Insert cool and awesome Latin name here] - this species is 3 times the size of a lobster from front to tail, and a powerful hunter. Operating in swarms, they are my worlds equivalent of the ...

Firstly, I'm not looking for an organism that gives birth to two separate species (like a human that gave birth to a human baby and a puppy) as I'm fairly sure that is impossible (though feel free to ...

Suppose we have a civilisation which is made up of many creatures sharing a single hive mind. Each creature can see, hear and remember what each other member of the species (or possibly hive) has seen ...

The Phoenix appears in Greek mythology and are most commonly seen as beautiful golden birds that burst into flame and are reborn from the ashes. Is there a realistic way that they could evolve? Using ...

Animals on Earth have 2 or 4 legs they use for walking. On another world, however, animals have 3. I want to know how these animals will walk. How will their legs be placed and how will they move them ...

In one of my fictitious planets, there are large cells that reside in the ocean and are 3 feet (almost 1 metre) in diameter. The cells themselves are aggregates of many amoeboid cells, have only one ...

Starting with a creature and its environment, how does one create its psychology?
Evolutionary biology and evolutionary psychology attempt to explain attributes that we observe in our fellow humans ...

Suppose a species possessed different sets of DNA for different parts of its anatomy. I'm not suggesting one set for every function in the body; that would result in hundreds of thousands of unique ...

As per my previous question on giants, if the average human is 5′10″, and he is scaled up to 50 feet whilst remaining proportionately correct, would this have any effect on what he sounds like?
I'm ...

Most species of animal, especially mammals, have a special skin cell the produces melanin, which is responsible for the color of their skin, but orcs are generally depicted as green creatures and, of ...

There is a species that is quite sentient. Its members know about the world, they have hopes and dreams and great aspirations of what they might do with their lives. They are intelligent, creative, ...

I have a moment in my story where the main character comes across a planet with "solid" swamps. Let me explain.
Basically, there are creatures here that can swim through the ground like it was some ...

I have a sapient (alien) species that behaves more or less similarly to humans, and that includes their romantic interactions. However, although they court/date each other much like we do, there is a ...

Exhibit A: The apex predator of my world, one that can both fly and swim under water.
This deadly monster employs 4 limbs - they act as wings in the air, and fins in the water. It hunts for game in ...

Imagine a race of what we would call 'giants', each of them possibly around 8 to 10 feet (2.40-3.00 meters) tall. What differences would they need compared to us regular humans in order to function? I ...

Imagine that when Christopher Columbus sailed West in his Carrack to travel around the world to reach India, he had never made it to land, because halfway across the Atlantic Ocean between Europe and ...